ADIN2111CCPZ-R7 datasheet(29/129 Pages) AD

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Data Sheet

ADIN2111

ON-CHIP DIAGNOSTICS

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Rev. A | 29 of 129

LOOPBACK MODES

Each of the two PHY cores on the ADIN2111 provides the following

loopback modes:

►

Physical medium attachment (PMA) loopback

►

Physical coding sublayer (PCS) loopback

►

MAC interface loopback

►

MAC interface remote loopback

►

MAC loopback

►

Host processor loopback

These loopback modes test and verify various functional blocks

within each PHY. The use of a frame generator and frame checkers

allows completely self contained in-circuit testing of the digital and

analog datapaths within each PHY core.

PMA Loopback

The PHY 1 and PHY 2 can be configured in PMA loopback mode.

In that case, the MDI must be left open circuit, thereby transmitting

into an unterminated connector or cable. In this mode, the signal

transmitted from the respective ADIN2111 PHY is echoed back from

the open 10BASE-T1L MDI. This test mode is an implementation

of the PMA local loopback function defined in Subclause 146.5.6 of

the IEEE Standard 802.3cg. Remove any cable connected to the

MDI to improve the test mode accuracy.

If configured in PMA loopback mode, the respective PHY must

be configured in forced link configuration mode (autonegotiation

disabled). To enable PMA loopback mode, set the 10BASE-T1L

PMA loopback enable bit ( B10L_LB_PMA_LOC_EN ) to 1 in the

10BASE-T1L PMA control register (B10L_PMA_CNTRL) of the

respective PHY.

PCS Loopback

PCS loopback mode loops the transmit data back to the receiver

within the PCS block at the input stage of the PHY 1 (respectively

PHY 2) digital block. Setting the B10L_LB_PCS_EN bit to 1 in the

10BASE-T1L PCS control register (B10L_PCS_CNTRL) on PHY

1 (respectively PHY 2) enables PCS loopback mode on PHY 1

(respectively PHY 2).

When the PCS loopback mode is enabled on PHY 1 (respectively

PHY 2), no signal is transmitted to the PHY 1 (respectively PHY 2)

MDI pins.

MAC Interface Loopback

MAC interface loopback mode loops the data received on the

ADIN2111 PHY 1 (respectively PHY 2) MAC interface back to

the SPI host, and can therefore be used to verify MAC interface

connectivity. Set the MAC_IF_LB_EN bit in the MAC interface loop-

backs configuration register (MAC_IF_LOOPBACK) to 1 on PHY 1

(respectively PHY 2) to enable MAC interface loopback mode on

PHY 1 (respectively PHY 2).

If the MAC_IF_LB_TX_SUP_EN bit in MAC_IF_LOOPBACK is set

(enabled by default) on PHY 1 (respectively PHY 2), the transmis-

sion of the signal received on the PHY MAC interface is not

transferred to the ADIN2111 PHY 1 (respectively PHY 2) core.

MAC Interface Remote Loopback

MAC interface remote loopback mode requires a link up with

a remote PHY and enables looping of the data received on

the ADIN2111 PHY 1 (respectively PHY 2) to the remote PHY.

This linking allows a remote PHY to verify a complete link

by ensuring that the PHY receives the proper data. Set the

MAC_IF_REM_LB_EN bit in the MAC interface loopbacks configu-

ration register (MAC_IF_LOOPBACK) to 1 on PHY 1 (respectively

PHY 2) to enable MAC interface remote loopback mode.

If the MAC_IF_REM_LB_RX_SUP_EN bit in MAC_IF_LOOPBACK

is set (set by default), the data received by the ADIN2111 PHY 1

(respectively PHY 2) from the MDI pins is not transferred to the

ADIN2111 MAC.

MAC Loopback

MAC loopback mode loops the data received on the MAC transmit

channel of Port 1 or Port 2 back to the SPI host.

MAC loopback mode can be enabled on PORT1 by setting the

MAC loopback bit (P1_LOOPBACK_EN) to 1 in the P1 MAC loop-

back enable register (P1_LOOP).

MAC loopback mode can be enabled on PORT2 by setting the

MAC loopback bit (P2_LOOPBACK_EN) to 1 in the P2 MAC loop-

back enable register (P2_LOOP).

Host Processor Loopback

Outside of the loopback modes associated with the PHY cores

within the ADIN2111, the host processor can be used to create a full

MAC loopback. In a full MAC loopback, whatever frame is received

from the MAC is transmitted back to the MAC, as shown in Figure

10.

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